The Rudraksha is a large evergreen broad-leaved tree that grows in the area from the Gangetic Plain to the foothills of the Himalayas. Rudraksha trees are also found in middle areas of Nepal. Rudraksha seeds are covered by an outer shell of blue color when fully ripe, and for this reason are also known as blueberry beads. The blue colour is derived not from pigment but is structural.

Rudraksha beads are the material from which sacred garlands (108 beads in number) or rosaries are made. The term is used both for the berries themselves and as a term for the type of mala made from them. In this sense, a rudraksha is a Saivite rosary, used for japa mala. Repetitive prayer (japa) is a common aid to worship in Hinduism, and Rudraksha mala are worn by many Hindus. Rudrakshas are also used for treatment of various diseases in traditional Indian medicine.

The berries show variation in the number of grooves on their surface, and are classified on the basis of the number of divisions that they have. A common type has five divisions, and these are considered to be symbolic of the five faces of Shiva (Ref).